You cannot raise the standard against oppression, or leap into the breach to relieve injustice, and still keep an open mind to every disconcerting fact, or an open ear to the cold voice of doubt.
As a Jew reading about Jesus, I thought, 'He's a pretty good guy.' It's the same conclusion Monty Python drew in 'Life of Brian' - if people actually live what he did, it would be a pretty good world. But Jesus and Christianity have a tenuous relationship at best.
Every citizen who stops smoking, or loses a few pounds, or starts managing his chronic disease with real diligence, is caulking a crack for the benefit of us all.